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Discussion Starter #1
Recently, I went to the gas station and I was unable to add gas. The pump would shut off and I would be there for 20 minutes to get 5 gallons. In looking around the web, some say that the Vapor Canister Purge Valve is stuck open and other are saying there is a clog of small pellets in some hose causing the restriction.

Anyone have diagrams as to where the cannister and Purge Valve are located? Or if there are any troubleshooting I should do. I did have check engine light come on. I think the code was P040??? Catalytic something.

Thanks for the help!
 

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2017 Ford Taurus
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When my car does that at the pump, I turn the key to the on position and then off, that usually cycles the purge valve and I can fill as usual.
 

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Discussion Starter #3
Interesting.... I will have to try that. Sounds like rebooting the computer to fix an issue. :) Thanks for the tip!
 

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Recently, I went to the gas station and I was unable to add gas. The pump would shut off and I would be there for 20 minutes to get 5 gallons. In looking around the web, some say that the Vapor Canister Purge Valve is stuck open and other are saying there is a clog of small pellets in some hose causing the restriction.

Anyone have diagrams as to where the cannister and Purge Valve are located? Or if there are any troubleshooting I should do. I did have check engine light come on. I think the code was P040??? Catalytic something.

Thanks for the help!
Fueling is pure mechanical. There is a "fuel in pipe" to the tank, and a vapor vent back to the top of the filler. There is a piston valve at the bottom of the fuel inlet at the tank that is there to prevent fuel from leaking out if the car is turned over. Pic of one at the JY taken from a tank. The piston is held closed with an ultra light spring that should let fuel in from gravity. Maybe this is stuck shut. Also, this thing keeps one from sucking fuel out of the tank. Like theft.
-chart-
 

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Discussion Starter #5
Fueling is pure mechanical. There is a "fuel in pipe" to the tank, and a vapor vent back to the top of the filler. There is a piston valve at the bottom of the fuel inlet at the tank that is there to prevent fuel from leaking out if the car is turned over. Pic of one at the JY taken from a tank. The piston is held closed with an ultra light spring that should let fuel in from gravity. Maybe this is stuck shut. Also, this thing keeps one from sucking fuel out of the tank. Like theft.
-chart-
Thanks for the info. Is the piston in the engine compartment or the by tank? I was not sure if this was specific to my 2008 Taurus or Ford's in general. Also, my OBD code is P0430 if that helps.
 

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This device is inside the tank. The fill tube from the fill cap goes directly to this in the inlet in the tank.
-chart-
 

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Discussion Starter #7
OK - more clues. The cannister is OK and the Solenoid works fine. Question I have is...could the issue be that the silver flapper on the filler tube broke off and now it is wedged in the pipe somehwere? Currently, the gas cap shows an open hole with no silver flapper (like on most cars). Just a thought... I am hoping that someone with a 2008 Taurus can check and send a picture or verify that the fill cap does have this flapper valve.
 

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2005 Taurus SE
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OK - more clues. The cannister is OK and the Solenoid works fine. Question I have is...could the issue be that the silver flapper on the filler tube broke off and now it is wedged in the pipe somehwere? Currently, the gas cap shows an open hole with no silver flapper (like on most cars). Just a thought... I am hoping that someone with a 2008 Taurus can check and send a picture or verify that the fill cap does have this flapper valve.
Have had that issue three times now with three separate cars (including this 05 taurus) tried all the things you have. Upon removing the filler neck and looking inside, a small foil tab the size of a dime from some gas additive crap had made itself at home against the siphon screen and it was 100% causing the problem your having. So remove your filler and check it out.
 

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Discussion Starter #9
Have had that issue three times now with three separate cars (including this 05 taurus) tried all the things you have. Upon removing the filler neck and looking inside, a small foil tab the size of a dime from some gas additive crap had made itself at home against the siphon screen and it was 100% causing the problem your having. So remove your filler and check it out.
I am thinking that your experience may be the same. The reason why I say that is because I don’t see a flapper valve in the gas filler. Maybe it never had one or maybe it got broken off and fell down the tube. I was hoping a 2008 Taurus owner can check for me on their car. I have tried calling multiple dealerships and parts store and have been unsuccessful.
 

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IIRC 08 was when Ford started using that capless fuel system. Does your setup look like this?
216558
 

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Discussion Starter #11
Update: I think the issue maybe in the sender arm of the gas gauge in the tank. Apparently my daughter says it has always been like this (argh!!!). She would fill up and the gas gauge would only show half full. It would stay there until the gas was below half a tank. I am guessing that this sender arm gets stuck on something at the half way point??

Any help / advice would helpful on how to avoid dropping the gas tank and removing this sender mechanis.
 

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When VWs first arrived in the U.S. they didn't even have gas gauges - you were expected to write down the odometer reading and fill the tank when the mileage indicated that it needed refueling. Just zero the trip meter and re-fill when it hits 220 or so.
 
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